It is not possible to answer the question without information about the set B.
All that can be said is that if set B has n elements, that is, if the cardinality if B is n, then there are 2n possible subsets of B.
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A set "A" is said to be a subset of of set "B", if every element in set "A" is also an element of set "B". If "A" is a subset of "B" and the sets are not equal, "A" is said to be a proper subset of "B". For example: the set of natural numbers is a subset of itself. The set of square numbers is a subset (and also a proper subset) of the set of natural numbers.
If set A and set B are two sets then A is a subset of B whose all members are also in set B.
The answer depends on what the set b is and since you have not provided any information on that, there is no possible answer to your question.
A set A is a subset of a set B if A is "contained" inside B.
Set "A" is said to be a subset of set "B" if it fulfills the following two conditions:A is a subset of B, andA is not equal to B